摘要
通过大田配对试验,研究了常规耕作和深翻耕—起高垄耕作对土壤—作物的降Cd效果。结果表明:与常规耕作相比,深翻耕—起高垄处理的油菜生物量、Cd富集量和植株Cd的移除率分别提高了22%~39%、28%~180%和56%,后茬水稻茎叶、根的Cd含量和富集系数也分别提高了28%~57%、27%~50%,糙米Cd含量显著降低了42%。此外,深翻耕—起高垄处理0~30 cm土壤中的总Cd含量降低了11%~56%,15~30 cm土壤二乙烯三胺五乙酸提取态Cd(DTPA-Cd)含量也显著降低了59%。糙米Cd含量与土壤DTPA-Cd含量、植株Cd富集转运系数呈显著相关。水田旱作季应用深翻耕—起高垄耕作措施,可能通过提高油菜Cd的移除率,降低了土壤总Cd、Cd生物有效性和水稻Cd转运,从而降低糙米Cd含量。
A paired field experiment was conducted to compare the effect of conventional tillage and deep plowing combined with high-ridging tillage on Cd reduction in soil and crop organisms.The results showed that compared with conventional tillage,the biomass,Cd enrichment,and Cd removal efficiency of rape in deep plowing combined with high-ridging tillage treatment was increased by 22%~39%,28%~180%and 56%,respectively.The Cd concentration in rice stem and leaf,and root increased by 28%~57%and 27%~50%,respectively,whereas the concentration of Cd in brown rice was significantly reduced by 42%.In addition,the total Cd content in 0~30 cm soil was decreased by 11%~56%,and the content of diethylenetriamine pentaacetic acid extractable Cd(DTPA-Cd)in 15~30 cm soil was reduced by 59%.The Cd concentration in brown rice was significantly correlated with the soil DTPA-Cd content,plant Cd enrichment and transport coefficient.The application of deep plowing combined with high-ridging tillage in the rape season under rape-rice rotation ecosystem may reduce the concentration of Cd in brown rice by increasing the Cd removal efficiency of rape and reducing the total Cd,Cd bioavailability of soil,and Cd translocation of rice.
作者
张丽娜
盛浩
何雨茹
苏国荟
ZHANG Li-na;SHENG Hao;HE Yu-ru;SU Guo-hui(College of Resources,Hunan Agricultural University,Changsha 410128,China)
出处
《江西农业学报》
CAS
2024年第10期21-26,34,共7页
Acta Agriculturae Jiangxi
基金
国家重点研发计划部省联动项目子课题(2022YFD1700103-306)
湖南省重点研发计划项目(2023NK2026)
2024年湖南农业大学研究生科研创新项目“深翻耕、螯合淋洗修复镉污染水稻土的效果及机理”(CX20240658)。
关键词
糙米Cd
油菜—水稻轮作
耕层重构
Cd移除率
富集转运
Brown rice Cd
Rape-rice rotation
Plough-layer reconstruction
Cd removal efficiency
Bioconcentration and translocation
